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Written by Administrator
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Tuesday, 30 June 2009 15:28 |
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 All measurements are made by us.
Before Measuring:
- All tires are inflated to 40 psi
- 26" tires are mounted on a Mavic 261 rim (26mm outside width)
- 29"/700c tires are mounted on a Velocity Dyad rim (24mm outside width)
- Tires have been inflated to 40 psi or more for at least 24 hours
One sample is used for all measurements except weight. All available samples are weighed. | | TW | | Tread Width:
in mm & inches | Widest point of the tread. Measured at four different points and averaged. Tread width may be narrower than casing width on some tires. | | CW | | Casing Width:
in mm & inches | Widest point of the casing. Measured at four different points and averaged. Casing width may be wider than tread width on some tires. | | CH | | Casing Height:
in mm | Distance from top edge of the rim to the top of the casing. Does not include tread depth. Does include thickness of tread base rubber. | | TD1 | | Tread Depth at Center:
in mm | Top of the tallest tread block to the base rubber at the center line of the tire. | | TD2 | | Tread Depth at Edge:
in mm | Top of the tallest tread block to base rubber at the outermost edge of the tire. | | R1 | | Overall Radius:
in mm | Distance from center of hub axle to top of the tire. | | R2 | | Radius at Widest
Point of Tire:
in mm | Distance from center of hub axle to widest point of the tire. This may be the casing or the tread. | | |  | Volume Index v.3 | A relative number to compare air volume. Calculated by multiplying casing width by casing height (in mm) and moving the decimal point two places to the left. Because this is an outside measurement it is affected by thick casings and tread base rubber (i.e. if two tires have an index of 25.0 the actual volume of the tire with the thicker casing/base rubber is lower than the thinner casing/rubber tire). This is the third version of the index. | | | | Weight:
in grams | All tires are weighed on a digital scale. All available samples are weighed | | | | Tread Durometer | Hardness or softness of the tread rubber in the ShoreA scale as reported by the tire company |
Digital Calipers 
Measuring the tire radius 
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Last Updated on Tuesday, 30 June 2009 16:08 |
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